MAMADY NASSOU CONDE - Academia.edu (original) (raw)
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Papers by MAMADY NASSOU CONDE
In this contribution, Nano-sized ZnO particles were prepared by chemical route through aqueous so... more In this contribution, Nano-sized ZnO particles were prepared by chemical route through aqueous solutions of zinc acetate dihydrate and sodium hydroxide at low temperature (50 °C). The influence of concentration and the NaOH addition flow on the crystallinity and morphology of the nanoparticles were investigated. X-Ray Diffraction results showed that the as-prepared particles were zinc oxide without any annealing and ripening treatment when the [ -OH]/[Zn 2+ ] concentration ratio was at less 2. Below this value, the structure is a mixture of zinc acetate and/or zinc hydroxide. Transmission Electron Microscopy results showed that the [ -OH] concentration determines ZnO nanoparticles morphology and the slower NaOH addition flow promotes ZnO nanoparticles growth in the c-axis. Optical characterization using reflectance measurements have shown energies in the UV-visible range.
In this contribution, Nano-sized ZnO particles were prepared by chemical route through aqueous so... more In this contribution, Nano-sized ZnO particles were prepared by chemical route through aqueous solutions of zinc acetate dihydrate and sodium hydroxide at low temperature (50 °C). The influence of concentration and the NaOH addition flow on the crystallinity and morphology of the nanoparticles were investigated. X-Ray Diffraction results showed that the as-prepared particles were zinc oxide without any annealing and ripening treatment when the [ -OH]/[Zn 2+ ] concentration ratio was at less 2. Below this value, the structure is a mixture of zinc acetate and/or zinc hydroxide. Transmission Electron Microscopy results showed that the [ -OH] concentration determines ZnO nanoparticles morphology and the slower NaOH addition flow promotes ZnO nanoparticles growth in the c-axis. Optical characterization using reflectance measurements have shown energies in the UV-visible range.